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Bug seems to be linked to a new feature of Win 10 RS2 (Fall update): non closed app at shutdown will be restarted by the system upon boot...

In some way, Windows doesn't see  Resilio Sync as a backgrounded app and try to start it again while already running (and this bring the app to foreground).

https://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_perf-insiderplat_pc/programs-autostart-after-boot-in-windows-10-fall/09dd8d3e-7b36-45d1-9181-6587dd5d53ab?page=2

Relevant part:

Quote

Hello to everyone in this thread!
This is actually a change in the core functionality of Windows in this development cycle.

Old behavior:
- When you shut down your PC, all apps are closed
- After reboot/restart, you have to re-open any app you'd like to use

New behavior:
- When shutting down your PC, any open apps are "bookmarked" (for lack of a better word)
- After reboot/restart, these apps will re-open automatically

If you want to start with no apps open (other than those set to auto-start via Task Manager/Start), you'll need to ensure all apps are closed before shutting down or restarting the PC.

Why?

The desire is to create a seamless experience wherein, if you have to reboot a PC, you can pick back up quickly from where you left off and resume being productive.  This has far-ranging impacts across the OS (in a good way).

We'll discuss this more in the next flight release blog post, so stay tuned!